My most common use for Siri is creating lists in the Reminders app. My wife and I share a list titled "Groceries". This has replaced the pen and paper stuck to the front of the refrigerator.

I just realized that Siri will remember the most recently used Reminders list when adding items consecutively.1 So in one session, I start by declaring the name of the list but after that I can just add items without the list name.

Now I can just walk around the kitchen and add items to the shopping list like this: